Rainfall, water, sediment yields and evaporation were quantified in three catchment areas with undisturbed rain forest, selectively logged forest, and forest with shifting cultivation respectively. Despite a considerable regional variation in rainfall(1700-2300 mm/a), annual evaporation rates were similar (1209-1314 mm/a). The impact of land use practices on water yield is negligible compared to the effect of rainfall.
Résultats de la recherche
Showing items 1 through 9 of 5.-
Library ResourceRapports et recherchesdécembre, 1997Cameroun
-
Library ResourceArticles et Livresdécembre, 1997
The effect of two practices adopted by settlers (abandoned pasture and fallow land) on soil fertility of two deforested Amazonian regions (Belém-Pará and Ariquemes-Rondônia) was studied. Whenever possible, cultivated pasture, over similar time periods in both cases and in natural forest, were employed as soil fertility reference standards. Nutrient dynamics was studied using the electroultra-filtration technique. In general, deforestation, as practiced in these areas, has a degrading effect on soil fertility. The effect of burning normally leads to a pH rise caused by ash.
-
Library ResourceLégislationfévrier, 1997Lettonie
The Law provides rules on different types of protection zones, protected areas, and protection strips, which are specified in laws and other regulatory enactments. Its purpose is to determine the types of protection zones and the functions thereof; the basic principles for the establishment of protection zones; the procedures for the maintenance and control of the condition of protection zones; and restrictions of economic activity in protection zones.
-
Library ResourcePolitiques nationalesavril, 1997Pologne
The National Policy on Forests developed by the Ministry of Environmental Protection, Natural Resources and Forestry is a nation-wide sectoral document for designating the complex of actions shaping relations between humankind and forests, with the aim of preserving the conditions for the indefinite maintenance of the multi-functionality of forests, their multi-faceted utility and protection and their role in the shaping of the natural environment, in line with the present and future expectations of society.
-
Library ResourceLégislationmai, 1997Malawi
This Act provides for the management and conservation of forestry resources in Malawi.
Rechercher dans la bibliothèque foncière
Grâce à notre moteur de recherche robuste, vous pouvez rechercher n'importe quel document parmi les plus de 64 800 ressources hautement conservées dans la bibliothèque du foncier.
Si vous souhaitez avoir un aperçu de ce qui est possible, n'hésitez pas à consulter le guide de recherche.